concatdds.js

import {globby} from 'globby';
import fs from 'fs';
import {execSync} from 'child_process';

const path = 'C:\\Users\\jaspe\\out\\\\';

const filePaths = (await globby('**/*.dds', {cwd: path})).map((pathSuffix) => path + pathSuffix.replace(/\//g, '\\'));

let count = 0;

for (let filePath of filePaths) {
    const folder = filePath.split('\\').slice(0, -1).join('\\') + '\\';
    const fileName = filePath.split('\\').slice(-1)[0].slice(0, -4);

    const allGroupFiles = (await globby(`**/${fileName}\.[!png]*`, {cwd: folder})).map((pathSuffix) => folder + pathSuffix);

    if (allGroupFiles.length > 1) {
        const relevantGroupFiles = [...allGroupFiles].filter((path) => !path.endsWith('a'));
        relevantGroupFiles.sort((file1, file2) => file1.localeCompare(file2));
        relevantGroupFiles.splice(1, relevantGroupFiles.length - 2);

        const [headerFilePath, dataFilePath] = relevantGroupFiles;
        const headerFileBuffer = fs.readFileSync(headerFilePath);
        const dataFileBuffer = fs.readFileSync(dataFilePath);

        headerFileBuffer[0x1c] = 0; // set mip count

        const fullFileBuffer = Buffer.concat([headerFileBuffer.slice(0, 0x94), dataFileBuffer]);

        allGroupFiles.forEach((filePath) => fs.rmSync(filePath));
        fs.writeFileSync(`${folder}${fileName}.dds`, fullFileBuffer);
    }

    /*const buffers = allGroupFiles.map((path) => fs.readFileSync(path));
    const all = Buffer.concat(buffers);
    allGroupFiles.forEach((path) => fs.rmSync(path));
    fs.writeFileSync(`${folder}${fileName}.dds`, all);*/

    try {
        execSync(`texconv.exe "${fileName}.dds" -ft png -y`, {env: process.env, cwd: folder});
        fs.rmSync(filePath);
    } catch (a) {
        try {
            execSync(`texconv.exe "${fileName}.dds" -ft png -f rgba -y`, {env: process.env, cwd: folder});
            fs.rmSync(filePath);
        } catch (b) {
            console.log(`Couldn't convert ${folder}${fileName}`);
        }
    }

    console.log(`Assembled and converted ${++count} of ${filePaths.length}\t${folder}${fileName}`);
}